eufy FamiLock S3 Max Palm Vein Smart Lock
- Palm vein unlock in 0.6 seconds, data stored on the lock
- 2K HD camera, f/1.8 lens
- 150 degree head-to-toe view doorbell
- Rear video screen inside the door
- Rechargeable battery up to 4 months, plus 4 AAA backup
- BHMA Grade 1, 16GB built-in storage
- Matter, Apple Home, Google Home, Alexa, SmartThings
- HomeBase 3 compatible, not HomeBase 2
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A deadbolt, doorbell camera and indoor screen in one, unlocked by palm vein scan. Camera streams do not pass through Matter, so the full feature set stays inside the eufy app.
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ASIN: B0DTHMFMKPModel: FamiLock S3 MaxCategory: Deadbolts
Overview
A family with kids or older parents at home gets a lock that shows the visitor on an indoor screen, no phone needed. The eufy FamiLock unlocks by palm vein scan, rings as a video doorbell and records locally to built-in storage.
The rear screen is the standout: anyone inside can see who is outside without opening an app. Palm vein reading is harder to fake than a print on a pad. Smart home control through Matter covers locking, but camera streams need the eufy app.
Who it's for
Homes where someone is often in without a phone benefit most from the screen inside. Owners of an older eufy base station setup will not get it linked.
Pros and cons
- Indoor screen shows visitors without an app
- Palm vein scan resists forgery
- Local storage, no cloud needed
- AAA backup during outages
- Camera streams not supported via Matter
- Not compatible with HomeBase 2
- Door thickness range not listed
- Install steps not described
Performance notes
Palm vein reading looks at the pattern under the skin, which is why surface wear on the hand matters less than with prints. The camera, screen and lock share one rechargeable pack, and the AAA set only powers essential functions during an outage.
Specifications
| Brand | eufy |
|---|---|
| Model | FamiLock S3 Max |
| Capacity & performance | |
| Memory storage capacity | 16GB built-in |
| Unlock speed | 0.6 seconds |
| Power & efficiency | |
| Convenient Rechargeable Power System | Rechargeable battery up to 4 months, plus 4 AAA emergency batteries for an extra month |
| Compatibility & installation | |
| Hub compatibility | HomeBase 3; not HomeBase 2 |
| Matter Over Thread For Multi-ecosystem Compatibility | Matter with Apple Home, Google Home, Alexa, SmartThings; no camera streams |
| Other details | |
| Lock Type | Deadbolt with video doorbell |
| Security grade | BHMA Grade 1 |
| Camera resolution | 2K HD, f/1.8 lens |
| Additional Features | Rear lock video screen |
| Field of view | 150 degree head-to-toe |
| All-in-one Unlocking Options | Palm vein recognition |
Frequently asked questions
How do I install the eufy FamiLock S3 Max?
The listing does not describe installation steps, tools or door thickness. Confirm the fit with eufy before ordering.
Does the eufy FamiLock S3 Max work with HomeBase 2?
No. The listing says it is compatible with HomeBase 3 and not with HomeBase 2.
Can I view the eufy FamiLock camera in Apple Home?
Not the camera. Matter covers the lock, but camera streams are not supported via Matter and need the eufy app.
What happens if the eufy FamiLock battery runs out?
An emergency set of 4 AAA batteries runs essential functions for about an extra month.
Where does the eufy FamiLock S3 Max store palm data?
The listing says all data is stored locally on the lock.